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Hill descent control (HDC)
PRINCIPLE OF OPERATION
The green HDC indicator lamp
illuminates. To deselect, press and
release again. The indicator lamp
will flash if all operating conditions are not met
(vehicle in neutral, vehicle speed above HDC
operating range).
Hill descent control (HDC)
Hill Descent Control (HDC) operates in
conjunction with the anti-lock braking system
to provide greater control in off-road situations
particularly when descending severe gradients.
During a hill descent, if engine braking is
insufficient to control the vehicle speed, HDC
automatically operates the brakes to slow the
vehicle and maintain a speed relative to the
selected gear range and the accelerator pedal
position.
You can select HDC at speeds below 80 km/h
(50 mph), but full HDC function is not active
until the vehicle speed falls below 50 km/h (30
mph).
If the vehicle speed exceeds 80 km/h (50 mph),
HDC will deselect and the green HDC indicator
will extinguish.
HDC should only be used in D, R and
CommandShift 1 in high range and in D, R and
all CommandShift gears in low range. When in
D, the vehicle will automatically select the most
appropriate gear.
If HDC is selected and the vehicle speed rises
above 50 km/h (30 mph) in high range, HDC
function is suspended and the green HDC
indicator will flash. A message will also appear
in the message centre.
Note: If Terrain Response is fitted, some of its
program and range combinations will activate
or deactivate HDC automatically.
If HDC is deselected when HDC is operating,
the system fades out, allowing the vehicle to
gradually increase speed.
USING HDC
In low range, HDC controls the vehicle speed
more aggressively. Use low range when
descending steep slopes.
WARNING
Do not attempt a steep decent if HDC is
inoperative or warning messages are
displayed.
When driving off-road, you can select HDC
permanently to ensure that control is
maintained. ABS and traction control are still
operational.
Note: HDC is automatically deselected if the
starter switch is turned off for more than six
hours.
With HDC selected, gear changes can be
performed in the normal way.
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Press and release the button (arrowed) to
select HDC.
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R
Hill descent control (HDC)
Hill Descent Control in action
Hill Descent Control (HDC) faults
Faults in the HDC system are displayed via the
message centre.
If an HDC fault occurs, HDC will fade-out and
then deselect, or deselect immediately
(depending on the type of fault and whether or
not HDC is in operation). The message
SYSTEM NOT AVAILABLE will appear in the
message centre. Consult your Land Rover
Dealer/Authorised Repairer as soon as
possible.
1
2
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Note: HDC fade-out gradually decreases the
HDC function with the effect that the rate of hill
descent will increase. HDC will be disabled
completely once the descent is complete.
While HDC is controlling the vehicle speed,
descent speeds can be varied using the
steering-wheel-mounted cruise control
switches. To reduce the descent speed, press
and hold switch 2. Release the switch when the
desired speed is reached.
To increase the descent speed, press and hold
switch 1. Release the switch when the desired
speed is reached.
Alternatively, you can adjust the descent speed
by tapping switch 1 or 2. Each tap of the switch
will adjust the descent speed by approximately
0.5 km/h (0.3 mph).
If you depress the brake pedal when HDC is
active, HDC is overridden and the brakes will
perform as normal (a pulsation might be felt
through the brake pedal). If the brake pedal is
then released, HDC will start operating at the
reduced speed.
Note: Each gear has a pre-defined minimum
descent speed.
The descent speed will only increase if the
gradient is sufficiently steep to cause the
vehicle to accelerate as the braking effect is
reduced. On a shallow slope, pressing switch 1
may result in no speed increase.
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Hill descent control (HDC)
Messages
The following table lists the messages relating to Hill Descent Control (HDC) that could appear in
the message centre. Some messages will not apply to your vehicle and will therefore not appear.
Message
Meaning
What to do?
HDC FAULT
SYSTEM
NOT AVAILABLE
Hill Descent Control system
fault.
HDC
NOT AVAILABLE
IN THIS GEAR
HDC not operative because of Select correct gear if HDC is
incorrect gear selection. HDC is required. In Low range, HDC
fully functional in 1, R and D in operates in all gears.
High range. It operates in all
gears in Low range.
HDC
NOT AVAILABLE
SPEED TOO HIGH
HDC unavailable, speed
Reduce vehicle speed.
threshold exceeded. Maximum
HDC operating speed is 50
km/h (30 mph), maximum
speed for HDC selection is 80
km/h (50 mph).
HDC TEMPORARILY
NOT AVAILABLE
SYSTEM COOLING
HDC switched off while brake
system is cooling.
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Drive with care and do not
attempt to descend steep
slopes. Seek qualified
assistance immediately.
Wait until message disappears
before descending steep
slopes.